I judge this to be heated (5)
I believe the answer is:
irate
'this to be heated' is the definition.
(thesaurus)
'i judge' is the wordplay.
'judge' becomes 'rate' (rating is a kind of judging).
'i'+'rate'='IRATE'
(Other definitions for irate that I've seen before include "Angry, enraged" , "raging" , "Spitting feathers" , "Boiling" , "become irritated" .)